Adding and Editing Files
A file is any arbitrary file that can be uploaded from your hard drive. To add a file, select File* from the drop-down list. On the edit tab, you'll see an Upload button that lets you pick the file from your hard drive. This could be any sort of item, including a plain-text file, a Microsoft Word document, a Microsoft Excel spreadsheet, an executable program, an Adobe Acrobat document, and so on. When you add a file, the name of the item in Plone changes to the name of the file uploaded. So, if you upload a file called *book.pdf, it'll be accessible in Plone as book.pdf.
If the file is recognized as being text, then the contents of the file are shown in the Web page and are editable through the edit tab. Otherwise, the file is downloadable, and users must download it to their local hard drive and edit it there. Afterward they can upload it to the system. You'll note that a file object also has an extra download tab that lets you directly download the file.

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